Thank you very much for your good plugin.
I have only one issue.
Whenever the newsletter is generated, the plugin uses the default WP images folder (I guess).
But I use NextGen Gallery and in newsletters no thumbnail is used if I set the post thumbnail to be an image from NG Gallery.
Please, will you tell me what file and what variable I have to change to set the right path in order to get a nice newsletter with all the post thumbnails appearing?
If next gen integrates with the standard thumbnail system of wordpress there should no problem, otherwise you must code your own theme deriving a version of the (for example) default theme to pick up the image managed by next gen.